/**
 *
 */
package task;


import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * 线程池执行类配置
 *
 * @author scotthu
 * @date 2018年2月26日
 */

@Configuration
public class TaskExecutorConfig {

    /** Set the ThreadPoolExecutor's core pool size. */
    private int corePoolSize = 4;

    /** Set the ThreadPoolExecutor's maximum pool size. */
    private int maxPoolSize = 10;

    /** Set the capacity for the ThreadPoolExecutor's BlockingQueue. */
    private int queueCapacity = 10;

    @Bean
    public Executor cloudAsync() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setThreadNamePrefix("CloudExecutor-");

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务  
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行  
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        // 增加回调 TaskDecorator
        executor.setTaskDecorator(new ContextTaskDecorator());
        return executor;
    }
} 